From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Russell King <rmk+lkml@arm.linux.org.uk>
Cc: linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [CFT] MM: Pass a PTE pointer to update_mmu_cache() rather than the PTE itself
Date: Fri, 22 Jan 2010 14:50:19 +1100 [thread overview]
Message-ID: <1264132219.3601.28.camel@pasglop> (raw)
In-Reply-To: <20100120135202.GA20937@flint.arm.linux.org.uk>
On Wed, 2010-01-20 at 13:52 +0000, Russell King wrote:
> On VIVT ARM, when we have multiple shared mappings of the same file
> in the same MM, we need to ensure that we have coherency across all
> copies. We do this via make_coherent() by making the pages
> uncacheable.
>
> This used to work fine, until we allowed highmem with highpte - we
> now have a page table which is mapped as required, and is not available
> for modification via update_mmu_cache().
Looks good. I'll test when I'm back from LCA.
Cheers,
Ben.
next prev parent reply other threads:[~2010-01-22 3:50 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-01-20 13:52 [CFT] MM: Pass a PTE pointer to update_mmu_cache() rather than the PTE itself Russell King
2010-01-20 16:45 ` Geert Uytterhoeven
2010-01-20 16:45 ` Geert Uytterhoeven
2010-01-20 16:54 ` Russell King
2010-01-22 3:50 ` Benjamin Herrenschmidt [this message]
2010-02-09 2:43 ` Benjamin Herrenschmidt
2010-02-18 16:25 ` Russell King
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